ASP.NET PDF Viewer using C#, VB/NET

These tests were performed on a dual-CPU machine with hyperthreading enabled (making it appear as if there were four CPUs). Given that there were two physical CPUs, you might expect very linear scaling here that is, if one user uses 1 unit of CPU to process her inserts, then you might expect that two users would require 2 units of CPU. You ll discover that this premise, while sounding plausible, may well be inaccurate (just how inaccurate depends on your programming technique, as you ll see). It would be correct if the processing we were performing needed no shared resource, but our process will use a shared resource, namely the shared pool. We need to latch the shared pool to parse SQL statements, and we need to latch the shared pool because it is a shared data structure, and we cannot modify it while others are reading it and we cannot read it while it is being modified.

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Note I ve performed these tests using Java, PL/SQL, Pro*C, and other languages. The end results are very

The server s actions in response are simple: it locates the requested file relative to a root web directory, determines the MIME type from a fixed table, and sends the necessary response header and the content of the file through the client TCP connection When all this is done, the connection is disposed, and the session ends The main loop of the server task is a busy waiting loop we simply wait for requests indefinitely and handle them one by one..

much the same every time. This demonstration and discussion applies to all languages and all interfaces to the database. I chose Java for this example as I find Java and Visual Basic applications are most likely to not use bind variables when working with the Oracle database.

In order to test, we ll need a schema (set of tables) to work with. We ll be testing with multiple users and want to measure the contention due to latching most of all, meaning that we re not interested in measuring the contention you might observe due to multiple sessions inserting into the same database table. So, we ll want a table per user to be created and we ll name these tables T1... T10. For example: scott%ORA11GR2> connect scott/tiger Connected. scott%ORA11GR2> begin 2 for i in 1 .. 10 3 loop 4 for x in (select * from user_tables where table_name = 'T'||i ) 5 loop 6 execute immediate 'drop table ' || x.table_name; 7 end loop; 8 execute immediate 'create table t' || i || ' ( x int )'; 9 end loop; 10 end; 11 / PL/SQL procedure successfully completed. We ll run this script before each iteration of the test to follow in order to reset our schema and to force hard parsing to take place if we run a test more than once. During our testing, we ll follow these steps: 1. 2. 3. 4. 5. Run statspack.snap. Immediate start N of our java routines, where N will vary from 1 to 10, representing 1 to 10 concurrent users. Wait for all N to complete. Run statspack.snap. Generate the statspack report for the last two statspack IDs.

Listing 14-1 uses two techniques not directly related to web programming: Regex1 as a very simple and common active pattern for regular expression pattern matching. You learned about active patterns in 9. Our example is particularly interesting because it also shows how to use a parameterized active pattern. The value server as an asynchronous task. You learned about asynchronous tasks in 13. Many web servers handle multiple requests simultaneously, and highperformance web servers use asynchronous techniques extensively. In our example, the server task serves requests sequentially using a single thread, but we could just as well have started a dedicated thread for the server using more explicit threading techniques from System.Threading.